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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06e2382f9c220f0d3fd99e24f51935816878da3bee1afa938cdd7526ca3f7651' 
  AND token = 'GrAOsae/BnCGYcPusAYneqiErlNBb1MmD/tTGM9PvnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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