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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e80a981f5ef3e7081c2ce66834f94a8563f3367945533a1a4437efd95a0fba86' 
  AND token = '6K2/jr8IXqqwsl/r6H4R59/WFhiHAOQOd0y06a4XqB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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