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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d4c7d3a6159dc2e22abea14b1e8d0920d1fa15a2c1e3ef0518f2b577b2f778b' 
  AND token = 'koWJXxVvmySGQ3eRzx9ZaQed97lhwlfQAFqAY+CZ0w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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