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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee2ab0f5752ff69f20e2ae3b77fc8dddda3f3e64e37e4a6553fa511abc06fde3' 
  AND token = 'sC1FEMTzro7f0Z3N1MgCvv9sSsCeV885vFV2TpIWKJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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