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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd1f64ccdabd5f95ce665ada41802aab28a5755905b5fb0ba68d5bf3cbfb18c' 
  AND token = 'x3CycBsT8kvMDRP2nPHfhweHagdgm16GXTOxuQbPlrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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