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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68672c306625e076151a14010ccb162461b0ec17c4c39f642e1ef07f5e998fa0' 
  AND token = '9gsIDxp8/dQXcnsJgZf3gnncCgPVtPWYx3EPiekfxhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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