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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f300b7f5e4efe14987ef95a2a289259a887be54ff963283fc3e0ec3a6d1381e7' 
  AND token = 'b8wp0jbHvpk52/FJFNI7USSZZVObroJ64edNY3Jk3D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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