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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f332e389f958cf808a5e573c87455275304e592090254e2b9e889a5cfd3278c6' 
  AND token = 'DXNu/zplW3/aIA+vHHxk09AZvOjKULlJ7r7GSHeKSO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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