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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27e3b86c58af2a38e9e52612fb74710be722fb4085d4312757b42a2edd3bad5d' 
  AND token = 'J/qYzeAJVDb9oPtppGy2VKqug3ENb09Jl4bSDRKhN5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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