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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f21bf6ab2b0e3476178acbcf1abe563cdeb425949f883edba4c47d34f73590e2' 
  AND token = 'hx+ZG1nMo40DV9PmCxO7YU+9NrSomArHasmUq53a8cA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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