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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bf07aea70b5b2857aa66e583bf2f8de2ae42186643b6768b85f5a3dde9e3ca3' 
  AND token = 'q7+lHjVPf45GC5MAQof/BLJaHIc5MiuXk/L4x4Lr1nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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