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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7c3fe2b0183f2a2c51e3ad079be406e6ad0b175c4afb3e463f3ce4b36a59951' 
  AND token = 'o/YI8B9B1Cgm+yrmA2uH4LsnErXhijk0sLtq3MBi5YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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