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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95e270daca79a5f78602f801d6747f795ce0b9b6debdd4b23bbafa3552411d58' 
  AND token = '2a3/wtfFKynbHJG0c7vldlHS6ybo65LZ22PES2rM3DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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