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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23dd3e16f01105a7454e6d32e47ecb1f5634efe3adb4af95fb3ba89b0b103a41' 
  AND token = 'a5adogwM7U6UC18ZF6j9LowiXj+4GKZEKjQrbOEMzxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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