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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa4b02983227c6f17441fb94c401430eff347f2bd0ce2e67d0970c202a50ee4f' 
  AND token = 'h2nj2xRdCUTBIrSpnax5kCP/TXpoN73CnifSqX6fq5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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