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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f2131e0979fafc17c04d591c581bf4ccfa6a5b406818348139f3b1889ec6b2b' 
  AND token = '+uP/exA4OWsCPnsUtqJk2QHlf2jIObAFFlDjWJyJpWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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