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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ffab12123b92df615216428d0aaaca356216f736cb90fd90a9f3a22037dc9b5' 
  AND token = 'LmFXA2KY7WVPjWNdkwu2EmCyxsWVOmWyqO36jBR/2c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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