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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee64b0150e20bd605771fe1c6a19644759eaf7d88d4ab6fbd96a0a75ff9eecce' 
  AND token = 'RgL1YjObO1zO2BbslU1+Kv06rUu+j0GxYhpbcZj1khA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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