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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83235b909df246ae3638d39e25cbbbee964a914679bb958263d7a8cbc49040d8' 
  AND token = 'Uh25ut6IGvIHspzl9CiU8rB3qQTkSGlmnm7hKuCa83g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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