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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92cc1a526a2be3f89522c542b3a1749aeeab316a5e21c4115ff352a7077ddf2' 
  AND token = 'BoPVAkuDIn9tGGiD7cGm+vaXqBVBea8HmJ2U9worVwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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