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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c111635b380f1c3e6707875e6393ff4f95e5ca34f4b6c8c82e7f2f61915bf7' 
  AND token = 'a1grEEYcwAsyOfA7muozUkNDZylqy56qXrT8bWOvEQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}