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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd94e7968ca90300e02da4b23afbd0528f78ed158e00c8e8d46eb960f8634cede' 
  AND token = '2EWKq1WUg2yBj6+lfuPIZKO0Wrp04JJftw5o+EjlJDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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