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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a2063d590f7a69c557958ff25d05a606f36f452a6fffc302f479b6426dfb5a' 
  AND token = 'pfLsyGL2YdzJivlZdvAAEtbgrqi1uxvmYcm7q1KbadM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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