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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b51418df16b557fb0e5b8f43ca0cabc6823992faa3afbf974ec12cd5a657208' 
  AND token = 'DY45OvsHC5RE1cDPr7z0D/R9gGuMiCZC2GZHhKGxNzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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