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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c6827c137e63aa48ee0244d6a95a134ae15b7b2b299cd6ba7b7db170a13266' 
  AND token = 'QctGH6qu9bHrAdLdwGbESH3sqF+dVuSqAz50o3NoI/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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