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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df1eeb14528195b14a483911ce0a0d9cbd18c3736e4bd63e953d4d18bf5cc026' 
  AND token = 'x8PgaCo3r03Qm5T8apGqBiymlk+VurBA4dp3uxYNpmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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