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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e63c000680d1b2c3d25bfb430d6c0285d9c94ba985ca9250a0f26f78afad107f' 
  AND token = 'k3LDPxcPqm41TIuQHaH0JrNSFDIrJCzhat8aK81OXFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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