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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0174185833b1d065dbb836b572fb100abca06b209659e7a856ae974e3a90623b' 
  AND token = 'FARbU2Qn2OijikvfVBidUbQFcLC7mgvtTv3d1UwI34A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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