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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3af73c653188886a13a6e0e142a75f085977d12493aabdfb02c25a266399bf79' 
  AND token = '72rOcnmHbrzKvDZ1twB2PBkz3eFNsdUw793sKDE4sPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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