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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4753e2e16f14481a64fa87d5798438cd7387e7100ac1ef7d89f20707162dd8c' 
  AND token = 'kzZIPjE7SOSc3YARnvdlFK95epj/3oLRa5mtLp1b8KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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