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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f12120d88e95610767ddded0be71d01a395c8238c64203a84ec757d4d0d9397e' 
  AND token = '5GMMML5w8ovON4u0pVE+3s5rOxiSuDpuBjaq25SVAtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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