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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8761d3176bdae873bf97e7f5fd85eb2b3bf99f8923feed8ba6be423bce0a4e0e' 
  AND token = 'VJwViX7BOSVEoVTq6O6LE8SKXKcliLj2V6JrMhtXyI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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