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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1bc653762e186adfdbd2d2f47ffc5dfbd6e60671e8f3fb495a0311fdce69f0d' 
  AND token = 'Uiyxy78PBD0oFdhpiPu4bg/ZsbHkDTQZjqRXA5pFeoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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