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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '513ce771f3f6fe864aed7636426c0b4e32ce67a6755b1335ac56ac95646a2b7c' 
  AND token = 'Ro7PlUoHKDlliu2K5nnoVtZSXfG0M7FYfIvdgR3bxjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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