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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c8b1120067ee219d0693bac6c166a1ed655bf12572b72563bacf0d9e50db15' 
  AND token = '3iR7TiC3ole5Rb4ThKV6HQgfSIRji0PXTF1PyhR6FQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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