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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f37230185468b010e02b015c6fb5466bc2858ae7dce9723bfba3aa3250c5e4a4' 
  AND token = '6U05NGdZaG/y9oIzjPstcFrEJqnaMO1u7ZSJ16l103s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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