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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '251864fae4af71fd649fcc10e96c5e2ab8c8e3c4fa0e8435472488a4295aa02d' 
  AND token = 'RzS24GonyK8AW+LHvdw3ISvmZZ9fjjZLnmRf44Vd/GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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