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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c53fb6f13a6d894ccbd6363774fad41b2bc5be4d1525dcb4952f7f1210881ab' 
  AND token = 'RkcVcyAr4iVnRO3JY5g4hfXftzfu118HiauZFKt1PfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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