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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd4dd7d20ae8cf5ab44647efb594975665c0efa322d126bfbed7a7a8c0e5d487' 
  AND token = 'JJwfuoY20lYfFVQC3832m2YkbwUkw77AZAUSHp6eIC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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