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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b66c5060e15c9d0a5a20c26d33310d0b994a7dac0f4e0ce9f5da24dce52b48b8' 
  AND token = '4OPtEChJCwawF6G9KLInvknlbeiLKaWigrTnPp8Sd/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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