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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60c7476d04852f7fce277cfffbf2097b8cb3730ecdf021fe925116234f0d1ce3' 
  AND token = 'D1bh3rzA0qsX8uR6QfdrRQ4K84pjEjF+2x8BeVUaMuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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