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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a1eff69ae3c6c137c10f42450e54751a8254a2d7c1be2d0aa932b8d81f23025' 
  AND token = 'hBBhpRDj/xK8gUJOH87Hqkm1mnynBirf5aKJT+m7R2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00190

JSON explain

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