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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc4e6b3ad1688f4dd4306fbe4e438eeeaabb1d0344a80a7f2dd84075cf11e24a' 
  AND token = '7QGzT1QGk/zKcjlWORVvufmpiw8czd8TOzLsWEL5J6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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