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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b71537f8a8f33d8f58c1c926940e265da17dac5fc9c57a8d3293cfdcb39c67fb' 
  AND token = 'qnsLa1Pexidb525SDNMKT5gfNDZ6yb5fMCMANwAVbHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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