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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fede87b67fb9e16e0f15de7909fb8ebc52af642be339375f35e8e4046fed7ec6' 
  AND token = 'Wx4jYGzwmuyvlOFvNMXfc5rObn13bMmFvZD3pCfs8vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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