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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '238ea14142bdb157a31d3f65f43d7a3c2a891185d7b81397f25809ddabf79091' 
  AND token = '1rRNQSklKQ6kIUbBr+1PEI1Z3zlh8whn7/3ANEVWlbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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