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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '862bd62fc46badbaac9dd25a51c78d23359307656f97c81c5fcf53e1a2690f82' 
  AND token = 'uk9tC5WZKPwhpZfT2sEAMFJjgNOqScrRG1gbY1iSdM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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