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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c69de58bb697fe3ad537deb250135f40d9bb7702f03d3e2f727102430a127671' 
  AND token = '61IDiD4nYiDH8+TOgOJJnN/fbHxYTs2keD6TYOJWwmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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