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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a399556028fbe53b561a5a21968edc901dbbbfbc8a02fc8005239d5eea960504' 
  AND token = 'vl20Ofa7BhmAB9UYnymiSD+t8U197gyPDV/XRH6waRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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