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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a406e1426856b67fec8c8ab2a0e173acc73ed854f0bd6e5a465b9b9e6a776795' 
  AND token = 'dGamNf5etB0uZI2em5ghrl1IMqQjQLtgl2dOlINGluE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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