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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8943abc3374828d2e712dba71d6b2d81b3e7340d27d7914782c3338dd6b5a2fb' 
  AND token = '9xcOrdocpSk3sjVbMY+kbvzHzzqZL/bg2y5Bsq47FFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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