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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2edcdb19fa1ca14a30e12ad7fd92c017cbb380116f6893590dba1f68a5fa59ec' 
  AND token = 'mS7TDaZ1IGj1BQRpYjlT01buhd4/l+VPyaRtoyOJJCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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