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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a1864e38a67ac6f14a9edb5ef682846eb73a17e847b67613e31c05d2adddb4' 
  AND token = 'GXFqw920jh+4zrZUBFarzw/ccS9keqtAq4JQsOKa950=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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