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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d6dd807f226ddd2667d5e59b0454cff063b946764825c51073dba8a54f46ca1' 
  AND token = 'wVnV1fi4E8vbM0T4/NVumM6kjjoWSz6UYLylpSjZouw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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