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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe8754ae14b70a5f831afdf47309b8a95f81c7e3e295ee096089f4f56d63f0af' 
  AND token = '8g+DfBU5FBv4LF3W6kW/z2d9dQ/c5pL89Bxmkjci0Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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