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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a423ff1e72f18c99d7e55bdbe786c2194875ed88e38ebdea1e112b15bc44537' 
  AND token = 'Lny4IcnMY1SVnNpuRT6m36C3Xm4ebFNwgvS5bH2XEL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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